); export const CardBody = ({ className, ...props }: HTMLAttributes) => (

); export const CardFooter = ({ className, ...props }: HTMLAttributes) => (

); ``` --- ## Theme Context Pattern **ThemeProvider.tsx:** ```tsx import { createContext, useContext, useState, useEffect, type ReactNode } from 'react'; type Theme = 'light' | 'dark' | 'system'; interface ThemeContextValue { theme: Theme; resolvedTheme: 'light' | 'dark'; setTheme: (theme: Theme) => void; } const ThemeContext = createContext(null); export function ThemeProvider({ children }: { children: ReactNode }) { const [theme, setTheme] = useState('system'); const [resolvedTheme, setResolvedTheme] = useState<'light' | 'dark'>('light'); useEffect(() => { const root = document.documentElement; if (theme === 'system') { const mediaQuery = window.matchMedia('(prefers-color-scheme: dark)'); const handleChange = () => { const resolved = mediaQuery.matches ? 'dark' : 'light'; setResolvedTheme(resolved); root.dataset.theme = resolved; }; handleChange(); mediaQuery.addEventListener('change', handleChange); return () => mediaQuery.removeEventListener('change', handleChange); } else { setResolvedTheme(theme); root.dataset.theme = theme; } }, [theme]); return ( {children} ); } export function useTheme() { const context = useContext(ThemeContext); if (!context) throw new Error('useTheme must be used within ThemeProvider'); return context; } ``` **Theme tokens in CSS:** ```css :root, [data-theme="light"] { --color-background: var(--color-white); --color-foreground: var(--color-gray-900); --color-muted: var(--color-gray-500); --color-border: var(--color-gray-200); --color-surface: var(--color-gray-50); } [data-theme="dark"] { --color-background: var(--color-gray-950); --color-foreground: var(--color-gray-50); --color-muted: var(--color-gray-400); --color-border: var(--color-gray-800); --color-surface: var(--color-gray-900); } ``` --- ## Compound Component Pattern **Select.tsx:** ```tsx import { createContext, useContext, useState, type ReactNode, type HTMLAttributes, } from 'react'; interface SelectContextValue { value: string; onChange: (value: string) => void; open: boolean; setOpen: (open: boolean) => void; } const SelectContext = createContext(null); interface SelectProps { value: string; onChange: (value: string) => void; children: ReactNode; } export function Select({ value, onChange, children }: SelectProps) { const [open, setOpen] = useState(false); return (

{children}

); } Select.Trigger = function SelectTrigger({ children }: { children: ReactNode }) { const ctx = useContext(SelectContext)!; return ( ); }; Select.Content = function SelectContent({ children }: { children: ReactNode }) { const ctx = useContext(SelectContext)!; if (!ctx.open) return null; return ( ); }; Select.Option = function SelectOption({ value, children, }: { value: string; children: ReactNode; }) { const ctx = useContext(SelectContext)!; const selected = ctx.value === value; return ( ); }; ``` --- ## Hook Patterns **useControllable (controlled/uncontrolled state):** ```tsx import { useState, useCallback } from 'react'; export function useControllable({ value, defaultValue, onChange, }: { value?: T; defaultValue: T; onChange?: (value: T) => void; }) { const [internalValue, setInternalValue] = useState(defaultValue); const isControlled = value !== undefined; const currentValue = isControlled ? value : internalValue; const setValue = useCallback( (next: T | ((prev: T) => T)) => { const nextValue = typeof next === 'function' ? (next as Function)(currentValue) : next; if (!isControlled) setInternalValue(nextValue); onChange?.(nextValue); }, [isControlled, currentValue, onChange] ); return [currentValue, setValue] as const; } ``` **useMediaQuery:** ```tsx import { useState, useEffect } from 'react'; export function useMediaQuery(query: string): boolean { const [matches, setMatches] = useState(false); useEffect(() => { const mediaQuery = window.matchMedia(query); setMatches(mediaQuery.matches); const handler = (e: MediaQueryListEvent) => setMatches(e.matches); mediaQuery.addEventListener('change', handler); return () => mediaQuery.removeEventListener('change', handler); }, [query]); return matches; } // Usage with breakpoint tokens const isMobile = useMediaQuery('(max-width: 767px)'); const isTablet = useMediaQuery('(min-width: 768px) and (max-width: 1023px)'); const isDesktop = useMediaQuery('(min-width: 1024px)'); ``` --- ## Export Pattern **index.ts (component barrel):** ```tsx // Components export { Button, type ButtonProps } from './components/primitives/Button'; export { Input, type InputProps } from './components/primitives/Input'; export { Card, CardHeader, CardBody, CardFooter, type CardProps } from './components/composite/Card'; export { Stack, type StackProps } from './components/layout/Stack'; // Hooks export { useTheme } from './hooks/useTheme'; export { useControllable } from './hooks/useControllable'; export { useMediaQuery } from './hooks/useMediaQuery'; // Context export { ThemeProvider } from './providers/ThemeProvider'; // Types export type { Theme } from './types'; ``` --- ## Testing Patterns **Button.test.tsx:** ```tsx import { render, screen } from '@testing-library/react'; import userEvent from '@testing-library/user-event'; import { Button } from './Button'; describe('Button', () => { it('renders children', () => { render(); expect(screen.getByRole('button', { name: 'Click me' })).toBeInTheDocument(); }); it('handles click events', async () => { const onClick = vi.fn(); render(); await userEvent.click(screen.getByRole('button')); expect(onClick).toHaveBeenCalledTimes(1); }); it('is disabled when loading', () => { render(); expect(screen.getByRole('button')).toBeDisabled(); expect(screen.getByRole('button')).toHaveAttribute('aria-busy', 'true'); }); it('applies variant classes', () => { render(); expect(screen.getByRole('button')).toHaveClass('danger'); }); }); ``` --- Source attribution: OpenDCAI Original project: https://github.com/OpenDCAI/leonai/blob/9a39b22e2359358837721bf7dc6dad72c185180c/.claude/skills/frameworks-react/SKILL.md License: MIT License information: https://opensource.org/license/mit Original upstream instructions; downloaded from Dave AI. ## Upstream license notice MIT License Copyright (c) 2026 nmhjklnm Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. # Dave AI resource metadata Creator / publisher: OpenDCAI Original project: https://github.com/OpenDCAI/leonai/blob/9a39b22e2359358837721bf7dc6dad72c185180c/.claude/skills/frameworks-react/SKILL.md Attribution basis: Source repository record Fields of work: Design, Development & Engineering, Product Management Roles: Frontend Developer, Product Manager, UX Designer Specialties: Cross Platform, Frontend Tools: Tool not specified Country applicability: Country not specified Classification basis: Source catalog labels Instruction SHA-256: 9659d37c52befba45dba401ea4a61fa9c2775699022ee96c78ae3bb008798e7a